[INFO] cloning repository https://github.com/iterate/miniwoop-backend
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iterate/miniwoop-backend" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e6bc456029694b3624ddb52a303126a58c68449
[INFO] documenting iterate/miniwoop-backend against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fiterate%2Fminiwoop-backend" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iterate/miniwoop-backend on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/iterate/miniwoop-backend
[INFO] finished tweaking git repo https://github.com/iterate/miniwoop-backend
[INFO] tweaked toml for git repo https://github.com/iterate/miniwoop-backend written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/iterate/miniwoop-backend already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded cfg-if v0.1.1
[INFO] [stderr]   Downloaded hyper v0.11.0
[INFO] [stderr]   Downloaded uuid v0.5.0
[INFO] [stderr]   Downloaded pretty_env_logger v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 47611100f5a41f9c9f1d15317497f55495060cebd85322d28c267465e6d1117e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "47611100f5a41f9c9f1d15317497f55495060cebd85322d28c267465e6d1117e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "47611100f5a41f9c9f1d15317497f55495060cebd85322d28c267465e6d1117e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47611100f5a41f9c9f1d15317497f55495060cebd85322d28c267465e6d1117e", kill_on_drop: false }`
[INFO] [stdout] 47611100f5a41f9c9f1d15317497f55495060cebd85322d28c267465e6d1117e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30c54b19ad116e0e4c9cd0d855170943eed5c21275fb05f5ab5c94c5deb4ffbb
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "30c54b19ad116e0e4c9cd0d855170943eed5c21275fb05f5ab5c94c5deb4ffbb", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.24
[INFO] [stderr]     Checking log v0.3.8
[INFO] [stderr]    Compiling semver v0.1.20
[INFO] [stderr]     Checking futures v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.1
[INFO] [stderr]     Checking num-traits v0.1.39
[INFO] [stderr]     Checking regex-syntax v0.4.1
[INFO] [stderr]     Checking serde v1.0.8
[INFO] [stderr]     Checking smallvec v0.2.1
[INFO] [stderr]     Checking take v0.1.0
[INFO] [stderr]     Checking dtoa v0.4.1
[INFO] [stderr]     Checking itoa v0.3.1
[INFO] [stderr]     Checking percent-encoding v1.0.0
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking httparse v1.2.3
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]     Checking base64 v0.6.0
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking iovec v0.1.0
[INFO] [stderr]     Checking thread-id v3.1.0
[INFO] [stderr]     Checking net2 v0.2.29
[INFO] [stderr]     Checking memchr v1.0.1
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking time v0.1.37
[INFO] [stderr]     Checking num_cpus v1.5.1
[INFO] [stderr]     Checking thread_local v0.3.3
[INFO] [stderr]    Compiling rustc_version v0.1.7
[INFO] [stderr]     Checking aho-corasick v0.6.3
[INFO] [stderr]     Checking bytes v0.4.4
[INFO] [stderr]     Checking num-integer v0.1.34
[INFO] [stderr]     Checking mio v0.6.9
[INFO] [stderr]     Checking num-iter v0.1.33
[INFO] [stderr]    Compiling unicase v2.0.0
[INFO] [stderr]     Checking num v0.1.39
[INFO] [stderr]     Checking tokio-io v0.1.2
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking futures-cpupool v0.1.5
[INFO] [stderr]     Checking regex v0.2.2
[INFO] [stderr]     Checking tokio-core v0.1.8
[INFO] [stderr]    Compiling serde_derive_internals v0.15.1
[INFO] [stderr]     Checking mime v0.3.2
[INFO] [stderr]     Checking tokio-proto v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.8
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking pretty_env_logger v0.1.1
[INFO] [stderr]     Checking hyper v0.11.0
[INFO] [stderr]     Checking chrono v0.3.1
[INFO] [stderr]     Checking serde_json v1.0.2
[INFO] [stderr]     Checking uuid v0.5.0
[INFO] [stderr]  Documenting miniwoop-backend v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `miniwoop-backend`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name miniwoop_backend src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern chrono=/opt/rustwide/target/debug/deps/libchrono-45c8a1b3dabbe03d.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-1b5eb95fd53be36f.rmeta --extern hyper=/opt/rustwide/target/debug/deps/libhyper-5ac98d83e6bb3bd4.rmeta --extern pretty_env_logger=/opt/rustwide/target/debug/deps/libpretty_env_logger-e4cdfe0097b63c3f.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-09a6a5416a23a4f1.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-d61e4644c91d8446.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-06cdb953675bf7ac.rmeta --extern unicase=/opt/rustwide/target/debug/deps/libunicase-94e1c36f96a466da.rmeta --extern uuid=/opt/rustwide/target/debug/deps/libuuid-e9b311458a27ab79.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "30c54b19ad116e0e4c9cd0d855170943eed5c21275fb05f5ab5c94c5deb4ffbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30c54b19ad116e0e4c9cd0d855170943eed5c21275fb05f5ab5c94c5deb4ffbb", kill_on_drop: false }`
[INFO] [stdout] 30c54b19ad116e0e4c9cd0d855170943eed5c21275fb05f5ab5c94c5deb4ffbb